The terahertz frequency band, which extends from 100 GHz to 3 THz is being studied for the next generation of wireless communication systems [1]}, [2]}. Expected applications include ultra high data rate short-range communication (e.g., device to device or chip-to-chip), as an alternative to free-space optics, and as a wifi-like system for small offices etc. There are many challenges in deploying terahertz communication systems including its high attenuation with distance as well as with reflections and frequency-specific molecular absorption. Among the frequencies available, channels at 140, 220, 340, 410, and 460 GHz have been identified as viable communication channels as they suffer the least (though still considerable) environmental attenuation [3]}. Thus, several different research efforts have been directed at developing communication systems at these bands. Examples of work most related to ours include prototype communication systems as proof of concept [4]}, [5]}, [6]}, [7]}, and channel models for line of sight (LoS) communication [8]}, [9]}, [10]}, [1]}, [12]}. Our work has been on using measurements to develop channel models for LoS channels and MIMO LoS channels [12]}, [14]}, [15]}, [16]}. In this paper we extend the channel model for the case of terahertz reflections off metallic and wooden surfaces. The channel model shows good agreement with measurements for both cases.
